2K8J

Solution structure of HCV p7 tm2


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

NMR structure and ion channel activity of the p7 protein from hepatitis C virus.

Montserret, R.Saint, N.Vanbelle, C.Salvay, A.G.Simorre, J.P.Ebel, C.Sapay, N.Renisio, J.G.Bockmann, A.Steinmann, E.Pietschmann, T.Dubuisson, J.Chipot, C.Penin, F.

(2010) J.Biol.Chem. 285: 31446-31461

  • DOI: 10.1074/jbc.M110.122895

  • PubMed Abstract: 
  • The small membrane protein p7 of hepatitis C virus forms oligomers and exhibits ion channel activity essential for virus infectivity. These viroporin features render p7 an attractive target for antiviral drug development. In this study, p7 from strai ...

    The small membrane protein p7 of hepatitis C virus forms oligomers and exhibits ion channel activity essential for virus infectivity. These viroporin features render p7 an attractive target for antiviral drug development. In this study, p7 from strain HCV-J (genotype 1b) was chemically synthesized and purified for ion channel activity measurements and structure analyses. p7 forms cation-selective ion channels in planar lipid bilayers and at the single-channel level by the patch clamp technique. Ion channel activity was shown to be inhibited by hexamethylene amiloride but not by amantadine. Circular dichroism analyses revealed that the structure of p7 is mainly α-helical, irrespective of the membrane mimetic medium (e.g. lysolipids, detergents, or organic solvent/water mixtures). The secondary structure elements of the monomeric form of p7 were determined by (1)H and (13)C NMR in trifluoroethanol/water mixtures. Molecular dynamics simulations in a model membrane were combined synergistically with structural data obtained from NMR experiments. This approach allowed us to determine the secondary structure elements of p7, which significantly differ from predictions, and to propose a three-dimensional model of the monomeric form of p7 associated with the phospholipid bilayer. These studies revealed the presence of a turn connecting an unexpected N-terminal α-helix to the first transmembrane helix, TM1, and a long cytosolic loop bearing the dibasic motif and connecting TM1 to TM2. These results provide the first detailed experimental structural framework for a better understanding of p7 processing, oligomerization, and ion channel gating mechanism.


    Related Citations: 
    • Structural and functional analysis of the HCV p7 protein.
      Saint, N.,Montserret, R.,Chipot, C.,Penin, F.
      (2009) Methods Mol.Biol. 510: 125


    Organizational Affiliation

    Institut de Biologie et Chimie des Protéines, UMR 5086, CNRS, Université de Lyon, IFR128 BioSciences Gerland-Lyon Sud, 69367 Lyon, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
p7tm2
X
29Hepatitis C virus genotype 1bMutation(s): 0 
Find proteins for P26662 (Hepatitis C virus genotype 1b)
Go to UniProtKB:  P26662
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the least restraint violations 
  • Olderado: 2K8J Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-01-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance